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(No Model.) 2 Sheets-Sheet 2.

B. R. HYDE 81R. 0. HORNER. HANGER FOR PULLEYS.

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Nv PETERS. PMwLithogr-upher, Wllhinghm. D. C.

I UNITED STATES PATENT OFFICE.

ELVIN R. HYDE AND RICHARD C. HORNER, OF SPRINGFIELD, MASSACHU- SETTS, ASSIGNORS TO THE SPRINGFIELD GLUE AND ELWIERY WHEEL COMPANY, OF SAME PLACE.

HANGER F OR PU LLEYS.

SPECIFICATION forming part of Letters Patent No. 407,954, dated July 30, 1889.

Application filed August 27, 1888- Serial No. 283.928. (No model.)

To (ZZZ whom it may concern.-

Be it known that we, ELWIN R. HYDE and RICHARD O.I-1oRNER, of Springfield, in the county of Hampden and Commonwealth of Massachusetts, have invented a new and useful Improvement in Compensating Hangers for Pulleys, of which the following is a specification, reference being had to the accompanying drawings, forming part thereof.

Our invention relates to hangers for pulleys having means for changing the position of the pulley or pulleys upon the hanger for the purpose of tightening the belt or belts pass ing over the former; and the invention has especial reference to means of this nature when used in connection with idler-pulleys, which serve to guide a belt from a primary shaft to a machine having a vertically-adjustable operating-shaft.

The object of our invention is to provide a hanger for pulleys which will be provided with means whereby the latter can be quickly and conveniently adjusted upon the hanger in a right line and through a considerable range of movement by a person standing upon the floor of the room to the ceiling of which the hanger is secured.

To this end our invention consists in the hanger constructed and operating as hereinafter fully described, and particularly pointed out in the claims.

Referring-to the drawings, in which like letters designate like parts in the several ligures, Figure 1 is an end elevation of our improved hanger, the same being shown in connection with 'a primary shaft and a machine having a vertically-adjustable operatingshaft. Fig. 2 is a front elevation thereof, the primary shaft, however, being omitted. Fig. 3 is a perspective view of one of the brackets of the hanger. Fig. 4 is a similar view of through which passes the screws or bolts which secure said brackets to the ceiling or other suitable support. Along their lower edge the brackets A A are provided with a dovetail rib a and within said rib is a longitudinal groove a Braces a secured at each end to one of said brackets, serve to rigidly connect them together. Upon each of said brackets, which thus form parallel ways, is mounted a block B, which blocks are provided within their upper surface with a dovetail groove 1) to receive the rib a thereby enabling them to be moved back and forth upon the brackets. A threaded hub b is connected to each of said blocks within the groove 1) by means of a pin on the former entering an orifice in the latter, as shown, or in any convenient manner, which hubs enter and travel inthe grooves a, and are thereby prevented from pivotal movement upon their connecting-pins. Upon each of the blocks B are located bearings 19 for the ends of the shaft carrying the idler-pulleys.

The form and number of idler-pulleys used will of course be governed by circumstances. \Ve have shown a drum B extending from one bracket to the other and mounted at each end in one of the bearings Z2 and a fixed shaft B also mounted at each end in one of said bearings and having loosely mounted thereon two pulleys b Provision is thus made for two belts, either of which can be moved laterally at will; but it will be understood that we have shown such construction for the purpose of illustration merely, and do not limit ourselves thereto. To the front end of bracket A is secured a plate a, and to the front end of the bracket A is securedaplate a, which plates respectively contain bearings c for the front ends of screw-shafts C C, said shafts being mounted therein in such manner as to revolve without endwise progression. Said screw-shafts extend rearwardly within grooves a and enter the hubs b on blocks B. (See Fig. 1, in which one of the blocks is partly broken away.) The shafts O O are provided with right and left hand screw-threads, respectively, and hubs b are similarly threaded. At their front ends said shafts C C are each provided with a bevel-gear. c, which gears mesh with corresponding gears 61 upon opposite ends of a cross-shaft D, mounted in bearings d on the plates a a whereby revolution of one of the screw-shafts is transmitted to the other in an opposite direction in the usual manner. Plate a is also provided with a bearing 6 for the upper end of a vertical shaft E, which shaft carries at its upper end a bevel-gear e, which meshes with the gear 0' of shaft 0. Shaft E extends downwardly to within easy-reaching distance of a person standing on the floor, and carries at its lower end a hand-wheel 6 or other similar device, whereby it can be revolved manually. It follows from the construction just described that by means of shaft E shafts C C can be operated in unison to move blocks B back and forth upon the brackets A A, and that said blocks will always be in alignment. It is obvious, also, that the belt orbelts led over one or more of the idlers carried by said blocks will be slackened or tightened as said blocks are moved in one or the other direction.

As hereinbefore stated, the compensating hanger thus constructed is especially designed for use in connection with machines having a vertically-adjustable operating-shaft, and we have accordingly illustrated it in connection with such a machine. The letter F designates a machine for surfacing metal, comprising a bedf, upon which the work to be operated upon is secured, and an emery-wheel f, mounted upon a vertically adjustable shaft carrying the band-wheel f By the vertical adjustment of the wheel it is enabled to operate upon work of various degrees of thickness,and by means of the compensating hanger its operating-belt can be kept tight in each of its various positions.

As shown, the belt G passes from a pulley or drum g on a power-shaft over drum B, thence around the pulley f on the emerywheel shaft, and thence over one of the idlerpulleys 5* back to pulley g. Whenever the operator changes the position of the emerywheel vertically, he can readily make a corresponding adjustment of the idlers by turning shaft E, and is thus enabled to keep belt G taut at all times. Any stretching of the belt or wearing away of the emery-wheel can also be compensated for in the same manner.

The hanger thus constructed is strong and durable and permits a very delicate adjustment of the idlers to be made.

\Ve do not wish to limit ourselves to the exact conformation or relative proportions of the parts shown and described, as various modifications therein can be made within the spirit of our invention.

herein described, comprising two brackets adapted to be suspended parallel, with each other from the ceiling or other suitable support, a block movably mounted upon each of said brackets, one or more pulleys located between said blocks and carried thereby, a screw-shaft mounted upon-each of said brackets and engaging a threaded hub on each of said blocks, and a cross-shaft and suitable connecting-gear for revolving said shafts simultaneously, whereby said blocks can be caused to move in unison upon said brackets, substantially as and for the purpose set forth.

2. The compensating hanger for pulleys herein described, comprising two brackets adapted to be suspended parallel with each other from a suitable support, a sliding block mounted upon each of said brackets, one or more pulleys having their axes mounted in bearings upon said blocks, a screw shaft mounted in such manner as to revolve without endwise progression upon each of said brackets, each of which screw-shafts operatively engages one of said blocks at one end and is provided at its opposite end with abevel-gear, a cross-shaft carrying at each end bevel-gears which mesh with the bevel gears on said screw-shafts,whereby the three shafts are compelled to revolve in unison, and a manuallyoperated shaft and gear arranged, substantially as described, for imparting a revolving movement to one of said shafts, substantially as set forth.-

3. The compensating hanger for pulleys herein described, consisting of two brackets suspended from the ceiling and parallel with each other, a block movably mounted upon each of said brackets, a pulley-shaft mounted at each end in one of said blocks, a pulley carried by said shaft, two screw-shafts having bearing in said brackets, each of which shafts operatively engages one of said blocks at one end and carries a bevel-gear at its opposite end, a cross-shaft carrying at each end bevelgears which mesh with the gears on said screw-shafts, and a vertical shaft having at its upper end a gear which meshes with one of the gears on said screw-shafts and having at its lower end a hand-wheel,-whereby it can be revolved manually, combined and operat ing substantially as andfor the purpose described.

4. In a compensating hanger for pulleys, the brackets A A, having the dovetail ribs a blocks B, having dovetail grooves b, shaft B having its ends mounted in said blocks, and pulleys b loosely mounted upon said shaft, combined and operating substantially as described.

5. The combination, with brackets A A, having dovetail ribs a and grooves c of blocks B, each having dovetail grooves b therein, and threaded hub 19, located within said groove, a pulley-shaft mounted at its ends on said blocks, and screw-shafts O C, mounted at or near one end in bearings on said brack- IIC ets and engaging said hubs b at their opposite ends, substantially as set forth.

6. The combination, with brackets A A, each having a dovetail rib a extending along its lower edge and having groove a Within said rib, of blocks B, each having dovetail grooves b in its upper surface andhaving threaded hub 19' located Within said groove, a pulley-shaft carried at each end by one of said blocks, screw-shafts O C, mounted in bearings at one end of said brackets, each of said shafts entering one of said hubs Z) at one end and having a gear 0 at its opposite end, cross-shaft D, carrying gears d at'its ends, which gears mesh respectively with one of the gears c, and vertical shaft E, carrying at its upper end gear 6, which meshes with one of the gears c, and having at its lower end hand- Wheel 6 arranged and operating substantially as set forth.

7. The combination, with brackets A A, of plate a, secured to said bracket A, said plate having the bearings c d e thereon, plate a secured to bracket A and having bearings c d thereon, shafts O C, mounted, respectively, in said bearings c c, and having gears c at one end thereof, shaft D, mounted in said bearings d d and having at its ends gears d, meshing With said gears c, and shaft E, mounted in said bearing 6 and having at its upper end gear 6, which meshes with the gear 0' on said shaft 0, arranged and operating substantially as and for the purpose described.

ELWIN R. HYDE.

RICHARD C. l-IORNER.

\Vituesses:

W. N. CHAPMAN, J. E. CHAPMAN. 

